HashSet contains() Method in Java
Last Updated :
26 Nov, 2018
The Java.util.HashSet.contains() method is used to check whether a specific element is present in the HashSet or not. So basically it is used to check if a Set contains any particular element.
Syntax:
Hash_Set.contains(Object element)
Parameters: The parameter element is of the type of HashSet. This is the element that needs to be tested if it is present in the set or not.
Return Value: The method returns true if the element is present in the set else return False.
Below program illustrate the Java.util.HashSet.contains() method:
import java.io.*;
import java.util.HashSet;
public class HashSetDemo {
public static void main(String args[])
{
HashSet<String> set = new HashSet<String>();
set.add( "Welcome" );
set.add( "To" );
set.add( "Geeks" );
set.add( "4" );
set.add( "Geeks" );
System.out.println( "HashSet: " + set);
System.out.println( "Does the Set contains 'Geeks'? " + set.contains( "Geeks" ));
System.out.println( "Does the Set contains '4'? " + set.contains( "4" ));
System.out.println( "Does the Set contains 'No'? " + set.contains( "No" ));
}
}
|
Output:
HashSet: [4, Geeks, Welcome, To]
Does the Set contains 'Geeks'? true
Does the Set contains '4'? true
Does the Set contains 'No'? false
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